Checking Tcxo Block; Only For Training And Service Purposes - LG E900 Service Manual

4. TROUBLE SHOOTING

4.3 Checking TCXO Block

The output frequency (19.2MHz) of TCXO (X331) is used as the reference one of RTR6285 and PM7540 internal
VCO.
R331
RTR_TRK_LO_ADJ
100
Clesed to TCXO
TP1
LGE Internal Use Only
TP1
X331 KT3225L19200DCW28RA0
TP1
1
VCONT OUT
2
C331
GND VCC
10n
19.2MHz
1.0T
Schematic of the Crystal Part(19.2MHz)
Schematic of the Crystal Part (19.2MHz)
TP2
C341
1n
0603
TP3
C332 100p
3
C339 1n
4
TP3
- 68 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
TP3
TP2
VREG_TCXO_2.85V
C340
0.1u
TCXO_PM_19.2MHZ
TCXO_RTR_19.2MHZ
TCXO_USB_XO

Only for training and service purposes

TP2